Marine Battery Weigh in - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 12 Old 07-30-2009
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,875
Thanks: 0
Thanked 7 Times in 7 Posts
Rep Power: 21
     
David...reserve capacity is not the traditional 20 hour rate that works best for boaters and inter battery comparison.
Reserve capacity is the number of minutes you can run a 25 amp load which is pretty huge for sailboats and a more useful spec for cars.

20 hour capacity is the number of amp hours a battery can deliver over 20 hours at a fixed rate. i.e. a 100 ah 20 hr rating means 5 amps for 20 hours may be withdrawn.

The two specs are NOT directly related nor can one be calculated from the other as different plate thicknesses and construction details will make some batteries perform better at the reserve capacity rate...and others at the 20 hour rate.
The reserve capacity on the Sears battery above works out to 85 amp hours at a 25amp discharge rate. I would expect it to be around 100ah-110 ah at a 20 hour rate based on size and weight but cannot say with precision.

Saurav 16 ...if the battery you linked to is the one you have...it looks like those tabs with the warnings on them each cover 3 cell holes that need to be watered. There is no claim of a sealed battey in the description.
If what you have is truly a sealed WET cell...which are made for cars...that is a VERY bad choice for a boat on a dockside charger and I encourage you to return it and get a real fillable wet cell or a true sealed AGM.

No longer posting. Reach me by PM!
camaraderie is offline  
Sponsored Links
Advertisement
 
post #12 of 12 Old 07-31-2009
Senior Member
 
patrickrea's Avatar
 
Join Date: Aug 2007
Location: Toronto
Posts: 407
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
 
Quote:
Originally Posted by davidpm View Post
The DieHard battery above specs do not mention the amp hour capacity. I find that typical even in the deep cycle batteries. How do you compare them without that info. Can it be found anywhere else?

I found my own answer. The reserve capacity is the new supposedly better measure of battery capacity.
Right on the Sears page once you dig down, that battery specs out at 115Ah at the 20 hour rate. It actually looks like a good bang for the buck at $119

Patrick Rea

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1978 30' Hughes Northstar 1000
1964 20' Bertram Moppie
patrickrea is offline  
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
How much does your dingy weigh? neoxaero General Discussion (sailing related) 9 03-12-2011 06:10 AM
How much does my Newport 27 weigh? russ1302 Newport 2 12-19-2006 11:38 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome